#define _CRT_SECURE_NO_WARNINGS 1

#include "Date.h"

Date& Date::operator+=(int day)
{
	if (day < 0)
	{
		return *this -= -day;
	}
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month > 12)
		{
			_month = 1;
			_year++;
		}
	}
	return *this;
}

Date Date::operator+(int day)const
{
	Date temp(*this);
	temp += day;
	return temp;
}

Date& Date::operator-=(int day)
{
	if (day < 0)
	{
		return *this += -day;
	}

	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month <= 0)
		{
			_month = 12;
			--_year;
		}
		_day += GetMonthDay(_year, _month);
	}
	return *this;
}

Date Date::operator-(int day)const
{
	Date temp(*this);
	temp -= day;
	return temp;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)
{
	Date temp(*this);
	*this += 1;
	return temp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date temp(*this);
	*this -= 1;
	return temp;
}

bool Date::operator==(const Date& d)const
{
	return _year == d._year
		&& _month == d._month
	    && _day == d._day;
}

bool Date::operator<(const Date& d)const
{
	if (_year < d._year)
	{
		return true;
	}
	else if (_year == d._year 
		&&_month < d._month)
	{
		return true;
	}
	else if (_year == d._year
		&&_month == d._month
		&&_day < d._day)
	{
		return true;
	}
	else
	{
		return false;
	}
}

bool Date::operator<=(const Date& d)const
{
	return *this < d || *this == d;
}

bool Date::operator>(const Date& d)const
{
	return !(*this <= d);
}

bool Date::operator>=(const Date& d)const
{
	return !(*this < d);
}

bool Date::operator!=(const Date& d)const
{
	return !(*this == d);
}

int Date::operator-(const Date& d)const
{
	int flag = 1;
	Date max = *this;
	Date min = d;
	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}
	int n = 0;
	while (min != max)
	{
		min++;
		n++;
	}
	return n * flag;
}